--- id_in.cpp.orig	2010-07-03 12:17:12.748542668 -0500
+++ id_in.cpp	2010-07-03 12:17:12.748542668 -0500
@@ -33,6 +33,7 @@
 // configuration variables
 //
 boolean MousePresent;
+boolean windowmouse;
 
 
 // 	Global variables
@@ -388,7 +389,7 @@
 
     SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
 
-    if(fullscreen)
+    if(fullscreen || windowmouse)
     {
         GrabInput = true;
         SDL_WM_GrabInput(SDL_GRAB_ON);
--- id_in.h.orig	2010-07-03 12:17:29.066570615 -0500
+++ id_in.h	2010-07-03 12:17:29.066570615 -0500
@@ -142,6 +142,7 @@
 extern  volatile char       LastASCII;
 extern  volatile ScanCode   LastScan;
 extern           int        JoyNumButtons;
+extern           boolean    windowmouse;
 
 
 // Function prototypes
--- wl_main.cpp.orig	2010-07-03 12:18:05.223561701 -0500
+++ wl_main.cpp	2010-07-03 12:18:05.223561701 -0500
@@ -1699,6 +1699,11 @@
         }
         else IFARG("--windowed")
             fullscreen = false;
+        else IFARG("--windowed-mouse")
+        {
+            fullscreen = false;
+            windowmouse = true;
+        }
         else IFARG("--res")
         {
             if(i + 2 >= argc)
@@ -1828,7 +1833,7 @@
             " --normal               Sets the difficulty to normal for tedlevel\n"
             " --hard                 Sets the difficulty to hard for tedlevel\n"
             " --nowait               Skips intro screens\n"
-            " --windowed             Starts the game in a window\n"
+            " --windowed[-mouse]     Starts the game in a window [and grabs mouse]\n"
             " --res <width> <height> Sets the screen resolution\n"
             "                        (must be multiple of 320x200 or 320x240)\n"
             " --resf <w> <h>         Sets any screen resolution >= 320x200\n"